Ring theoretical properties of affine cellular algebras

Abstract

As a generalisation of Graham and Lehrer's cellular algebras, affine cellular algebras have been introduced in [12] in order to treat affine Hecke algebras of type A and affine versions of diagram algebras like affine Temperley–Lieb algebras in a unifying fashion. Affine cellular algebras include Kleshchev's graded quasihereditary algebras, Khovanov–Lauda–Rouquier algebras and various other classes of algebras. In this paper we will study ring theoretical properties of affine cellular algebras. We show that any affine cellular algebra A satisfies a polynomial identity. Furthermore, we show that A can be embedded into its asymptotic algebra if the occurring commutative affine k-algebras Bj are reduced and the determinants of the swich matrices are non-zero divisors. As a consequence, we show that the Gelfand–Kirillov dimension of A is less than or equal to the largest Krull dimension of the algebras Bj and that equality holds, in case all affine cell ideals are idempotent or if the Krull dimension of the algebras Bj is less than or equal to 1. Special emphasis is given to the question when an affine cell ideal is idempotent, generated by an idempotent or finitely generated.